The Board of Elections has called in the Department of Investigation to determine if its executive director engaged in “actionable conduct” by unilaterally redesigning the ballot for an upcoming special vote in a way that could have skewed the outcome, The Post has learned.

“This is being taken very seriously,” said one insider. “This is the agency head. As long as I’ve been here, this has never happened.”

The board acted in response to a report in Tuesday’s Post that revealed that Executive Director George Gonzalez shifted candidate Ruben Wills from the first column on the Nov. 2 ballot to the second column, despite a previous decision by the commissioners to place him in the No. 1 spot.

The move had the effect of consigning Wills to the same row as the Republican candidates in the general election — the last place he’d want to be in the heavily-minority 28th Council District in Queens.

One source said commissioners were “livid” their directions had been ignored.

Gonzalez told The Post on Monday that the only reason he moved Wills was to create a sharper demarcation between the general-election contests and the nonpartisan council special election.

He denied claims by some critics that he was doing the bidding of election lawyer Stanley Schlein, who represents Wills’ rival Nicole Paultre-Bell, ex-fiancée of cop-shooting victim Sean Bell.